Accepted Answer

to your second question - There is no "moon" anything in Dark Souls, there is enchanted though which is the probably the best comparison to the moon weapons in Demon's Souls. However, the lightning spear is arguably the best spear in the game, but I would make my own from the Partisan (whjich can be found in the Darkroot Garden), winged spear, or Pike for the extra reach.

Other Answers

There is a winged spear in the graveyard before the catacombs near Firelink where you start the game. You can get a lightning spear from a mimic in Sen's Fortress after you've rung the two bells to open it. The lightning spear is especially gear, can take you all the way to NG+.